Extraction of Time Coherence Using Detection of Dominant Components for Underwater Acoustic Communication Channels at East Sea

Hyeonsu Kim; Jaeyoung Kim; Gunwoo Park; Seongil Kim; Jaehak Chung

doi:10.7776/ASK.2013.32.1.022

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Extraction of Time Coherence Using Detection of Dominant Components for Underwater Acoustic Communication Channels at East Sea 동해 연근해에서 수중통신 채널의 지배응답 검출을 통한 시간 상관도의 산출

31 January 2013. pp. 22-31

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Abstract

In this paper, we propose a method that estimates the channel response from underwater communication signals with MMSE (Minimun Mean Squared Error) and detects dominant components automatically based on power of response components using CFAR (Constant False Alarm Rate). Statistical characteristics are analyzed with variation of magnitude and phase and time coherence via experimental data obtained by drifting transmitter and receiver. We show that bit error rate has small difference, 1.2 times, compared with the case using every channel information estimated within data period when estimation and equalization is performed with extracted characteristic obtained by the proposed method.

Keywords

Underwater acoustic channel

Temporal coherence

MMSE estimation

CFAR detection

Phase fluctuation

본 논문에서는 전송된 수중통신신호로부터 MMSE(Minimun Mean Squared Error) 기법으로 채널 응답을 추정하고, CFAR(Constant False Alarm Rate) 기법을 이용하여 응답성분의 전력을 기준으로 채널의 지배적인 응답을 자동적으로 구하는 방법을 제안한다. 그리고 표류상태의 송수신단을 이용한 해상실험 데이터로부터 얻은 지배적인 응답에서 응답세기 분포와 위상 변화 그리고 시간 상관도를 산출하여 통계적 특성을 분석한다. 제안된 방법을 이용하여 구해진 통계적 특성을 실제 측정 데이터에 적용했을 때 모든 데이터 구간에서의 채널을 추정하지 않더라도 모든 데이터 구간에서의 채널을 추정하는 경우보다 비트 오류율이 약 1.2배로 차이가 크지 않음을 보였다.

키워드

수중음향채널

시간 상관도

최소평균자승 오차 추정

상수 오경보율 검출

위상 변화

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Information

Publisher :The Acoustical Society of Korea
Publisher(Ko) :한국음향학회
Journal Title :The Journal of the Acoustical Society of Korea
Journal Title(Ko) :한국음향학회지
Volume : 32
No :1
Pages :22-31
Received Date : 2012-08-31
Revised Date : 2012-11-05
Accepted Date : 2012-12-03
DOI :https://doi.org/10.7776/ASK.2013.32.1.022

The Journal of the Acoustical Society of KoreaISSN:1225-4428(Print) 2287-3775(Online)한국음향학회

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